Features: Rechargeable: rechargeable Remote and rechargeable Receiver. Waterproof Receiver: your pet can swim or walk in the rain with it. Adjustable Levels: You could adjust the level of Vibration mode and Shock mode from 1-99. Three training mode: Shock/Vibration/Sound. Three Channels: Choose channel for max 3 Receivers with one Remote. Auto Power Save: The Remote and Receiver will go into standby mode if no operations. Large range remote control: The range of Remote control is Over 300 meters. Adjustable collar size: Collar length range is 0.20-0.72m/7.87-28.3 suitable for all size dogs.